Since the outbreak was declared in October, 83 people have died, most of them children.
The Samoa Umbrella for Non-Governmental Organisations, or SUNGO, recently travelled to the island of Savai'i, providing food, supplies and counselling.
The group's chief executive, Fuimaono Vaitolo Ofoia, said the Christmas period was a struggle for many families in Samoa.
"It's a weird experience for them because of this traumatic disease and the circumstances they have gone through, the trauma, it's beyond any other."
Fuimaono said long-term support would be crucial.